Therefore, based on the feature of the spark machining, the parameters of evaluation and the method of determination of the roughness for the spark machining are presented.

文章依据电火花加工的特点，提出电火花加工工件表面粗糙度的评定参数和测试方法。

The surface has great difference between the spark machining and the cutting.

电火花加工的表面与切削加工的表面有很大区别.